Newton’s Rings

FRED allows for simulation of physical optics phenomena such as diffraction and interference. With this capability, components such as Gaussian laser beams and interferometers can be accurately modeled and incorporated into optical systems.

The FRED Model

Newton’s Rings form when reflections from a planer surface interfere with reflections from a spherical surface in contact. The interference pattern is based on increasing optical path difference from the point of contact outward. As spherical surface curvature increases, the amount of rings increases. A FRED model of Newton’s Rings is shown below: